Earth fault detection circuit for battery

The battery earthing fault detecting circuit is suitable for UPS system including battery case and controller, and the battery case has earthing end for detecting the earthing fault of the batteries and for the controller to perform corresponding protection program. The battery earthing fault detecting circuit includes sensor connected electrically to the earthing end of the battery case to sense the earthing current signal; signal treater connected electrically to the sensor to filter and amplify the earthing current signal; peak value comparator connected electrically to the signal treater to compare the treated earthing current signal with preset peak value and to produce AC control signal in case the larger earthing current signal peak; and signal converter connected electrically to the comparator to convert the AC control signal into DC control signal to the controller for triggering corresponding protection program. 电池接地故障检测电路，适用于不断电系统，该不断电系统包含电池箱及控制器，电池箱具有接地端，以检测设于电池箱内的电池是否发生接地故障并由控制器进行相应的保护程序。电池接地故障检测电路包含：传感器，电连接电池箱的接地端，以感测接地端输出的接地电流信号；信号处理器，电连接传感器，以对接地电流信号进行滤波及放大处理；峰值比较器，电连接信号处理器，具有预设峰值，以将经滤波及放大处理的接地电流信号与预设峰值进行比较，在接地电流信号的峰值大于预设峰值时产生交流控制信号；及信号转换器，电连接峰值比较器，将交流控制信号转换成直流控制信号传送至控制器，控制器根据直流控制信号的触发而对不断电系统进行相应的保护程序。